PetaPixel's blog is carrying the following. Some folks may already have seen it here or elsewhere.
http://petapixel.com/2014/09/01/cano...-up-to-33-off/
"It looks like Canon is looking to move some inventory — or at the very least score some brownie points with its users — because over the weekend, Canon announced a new permanent price drop on a vast selection of lenses, with discounts ranging from 5% to 33% off. ...."